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See detailMeasuring Time Delays in Gravitational Lenses
Eulaers, Eva ULg

Master of advanced studies dissertation (2008)

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See detailMeasuring Time Delays in Gravitational Lenses
Eulaers, Eva ULg; Magain, Pierre ULg; Sohy, Sandrine ULg et al

Poster (2008, September)

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See detailMeasuring Total Electron Content with GNSS: Investigation of Two Different Techniques
Bidaine, Benoît ULg; Warnant, René ULg

in The Institution of Engineering and Technology 11th International Conference on Ionospheric Radio Systems and Techniques (IRST 2009) (2009, April)

The ionosphere widely affects Global Navigation Satellite Systems (GNSS) applications, inducing among others a delay in GNSS measurements. This delay is closely linked to the Total Electron Content (TEC ... [more ▼]

The ionosphere widely affects Global Navigation Satellite Systems (GNSS) applications, inducing among others a delay in GNSS measurements. This delay is closely linked to the Total Electron Content (TEC) of the ionosphere, a major parameter which can hence be monitored using GNSS. To this extent, phase measurements are taken as a basis for their lower noise level. Levelling strategies have then to be defined for the phase measurements are obtained with an initial unknown number of cycles called ambiguity. The most common technique, referred to as carrier-to-code levelling, consists in using the differences between code and phase measurements and their average on a continuous set of epochs. This option, chosen at the Royal Meteorological Institute (RMI) of Belgium to compute TEC for Belgian GPS stations, requires code hardware delays estimation. Another has been proposed which takes benefit from Global Ionospheric Maps (GIMs) to compute a reference TEC used for ambiguity resolution. In order to understand the consequences of using one method or the other, we compare slant TEC data obtained from both techniques for a mid-latitude station (Brussels) during a high solar activity period (2002). We observed large differences (6.8 TECu on average) showing features apparently related to ionospheric and geomagnetic activity. We attribute these observations to a combination of effects originating in code delays estimation, multipath and noise as well as GIMs errors. We try to differentiate between these effects by focusing on several days and satellites. We concentrate for example on days presenting large TEC differences and geomagnetic disturbances simultaneously (or not) or on satellites displaying recurrent patterns on consecutive days. Finally we highlight the impact of the choice of GIMs involved in sTEC calibration. To this extent, we analyse vertical TEC statistics showing a general underestimation from RMI data. The highest bias (5.8 TECu) is obtained for the UPC GIMs used in the second levelling technique. [less ▲]

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See detailMEASURING VARIABILITY SOURCES IN NMR METABOLOMIC STUDIES
Rozet, Eric ULg; De Tullio, Pascal ULg; Hubert, Philippe ULg et al

Conference (2013, May 13)

Due to the huge amount of information available in NMR spectra obtained from the analysis of metabolomic experiments, multivariate analysis such as Principal Component Analysis (PCA) are required to ... [more ▼]

Due to the huge amount of information available in NMR spectra obtained from the analysis of metabolomic experiments, multivariate analysis such as Principal Component Analysis (PCA) are required to understand the influence of treatments over the metabolites [1]. However, many experiments in metabolomics studies have more complexes variability structures than simply comparing several treatments: they may include time effects, biological effects such as diet or hormonal status, and other blocking factors or variability sources: samples stability, age of the individuals, pH of a buffer, days of acquisition, and so on. Metabolomic data analysis needs to extract from the spectral data matrix the variations linked to a change indicated in the factor of interest. However other sources of variability may impair this objective. This stresses the importance to discover the sources of variability of the spectral metabolomic data using appropriate methodology. Classically, to analyze such data analysis of variance (ANOVA) or multivariate ANOVA (MANOVA) [2] is used. However direct application of these methodologies to NMR spectra obtained from structured metabolomics studies is inappropriate or impossible. More complex data analyses methodologies are required to understand the importance of the various factors implied in the experiments and to provide a measure of their variance components. Three related methodologies have been proposed to achieve this: ASCA [3], ANOVA-PCA [4] and AComDim [5]. The ASCA and ANOVA-PCA methodologies combine first an analysis of variance step (ANOVA) and then a PCA step. The AComDim one adds to the output of the ANOVA-PCA step a multi-block analysis. In this presentation, the usefulness and applicability of these advanced techniques to data analysis of NMR metabolomic spectra are provided to highlight the increase of knowledge gained and the estimation of main sources of variability arising in an experimental setup. Two NMR databases will be used [6]. The first one concerns human serum analyzed by 1H-NMR where three random factors are present: day of measurement (3 days), sample (2 samples per individual) and replication of analyses as well as two fixed controlled factors, time of measurement after thawing (2 times) and two protein suppression methods for the spectral pre-treatment. The second database is about the 1H-NMR analyses of rats’ urine where two different concentrations of citrate and of hippurate were deliberately added and three other sources of variability are present: urine pool diluted or not diluted, repetitions of analyses, days of analyses (three days), as well as two different spectral pre-treatment procedures. [less ▲]

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See detailMeat composition and quality of young growing Belgian Blue bulls offered a fattening diet with selenium enriched cereals
Mehdi, Youcef ULg; Clinquart, Antoine ULg; Hornick, Jean-Luc ULg et al

in Canadian Journal of Animal Science (2015), 95(3), 465-473

The objective of this study was to evaluate the effects of selenium (Se) enrichment of cereals on Belgian Blue bulls performance, on meat quality and chemical composition. Twenty three bulls were used in ... [more ▼]

The objective of this study was to evaluate the effects of selenium (Se) enrichment of cereals on Belgian Blue bulls performance, on meat quality and chemical composition. Twenty three bulls were used in the present study. Twelve bulls were offered a control diet containing Se at a basal concentration of 58 µg kg-1 of dry matter (DM) and the other 11 bulls given a diet containing 173 µg kg-1DM of Se by means of Se enriched spelt and barley. The Se enrichment of the diet did not affect either the growth performance, the slaughter data or meat quality (p>0.05). There were no effects of Se on tenderness, oxydative rancidity and water losses. However, there were some effects of Se enrichment on the meat chemical composition. The ether extract was decreased from 2.1 to 1.7% DM (p<0.05). There were also significant Se enrichment (p < 0.001) in Longissimus thoracis muscle (177 vs 477 ng g1-DM) and organs: liver (474 vs 1126 ng g1-DM) and kidney (4956 vs 5655 ng g1-DM), Under such condition, the human consumption of a piece of such meat or liver can cover a large part of the recommended daily Se intake estimated between 30 to 57%. [less ▲]

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See detailMeat quality in relation to breed (Belgian blue vs Holstein) and conformation (double muscled vs dual purpose type)
Clinquart, Antoine ULg; Van Eenaeme, Christian ULg; Van Vooren, Tom et al

in Proceedings of the International Workshop on Proteolysis and Meat Quality (1993)

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See detailLa mecanica respiratoria en terneros sanos respirando Helio-Oxigeno
Rodriguez, MN; Art, Tatiana ULg; Rollin, Frédéric ULg et al

in Proceedings of the XVIIIth Jordanas Uruguayas de Buiatria (1990)

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See detailMécanique analytique (1ère partie)
Dauby, Pierre ULg

Learning material (2010)

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See detailMécanique analytique (2ème partie)
Dauby, Pierre ULg

Learning material (2000)

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See detailMécanique des fluides
Dauby, Pierre ULg

Learning material (2007)

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See detailMécanique des fluides : Fascicule 1 : Appliquée à l'étude des coques et des ailes
Hanocq, Charles ULg

Book published by H. Vaillant-Carmanne (1954)

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See detailMécanique des fluides : Fascicule 3 : Appliquée à l'étude des turbo-machines
Hanocq, Charles ULg

Book published by H. Vaillant-Carmanne (1959)

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See detailMécanique des milieux continus
Dauby, Pierre ULg

Learning material (2007)

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See detailLa mécanique du détail. Approches transversales
Hagelstein, Maud ULg; Belloi, Livio ULg

Book published by Editions de l'Ecole Normale Supérieure de Lyon (2013)

Parce qu’elle a trait aux relations nouées entre les parties et l’ensemble qui les comprend, la question du détail s’investit d’enjeux considérables pour toute tentative de réflexion interdisciplinaire ... [more ▼]

Parce qu’elle a trait aux relations nouées entre les parties et l’ensemble qui les comprend, la question du détail s’investit d’enjeux considérables pour toute tentative de réflexion interdisciplinaire. En effet, dans les disciplines qui s’attachent à rendre un objet visible ou lisible, les théoriciens rencontrent à l’endroit du détail des problèmes voisins, sinon analogues, que nous voudrions ici aborder de front, dans une perspective forcément « rapprochée » et plus que jamais attentive à des objets singuliers, que ceux-ci relèvent de la littérature, du cinéma, de la photographie, de la bande dessinée, de la peinture, de la philosophie, etc. À confronter nos méthodes et les présupposés sur lesquels elles reposent, il nous a semblé possible de cerner plus finement le mode de fonctionnement propre au détail. Certes, chacun fera part ici de ses étonnements particuliers ; de même, chacun sera amené à faire rapport des découvertes enthousiasmantes ou perturbantes qui, dans son domaine spécifique, auront innervé le travail de réflexion. Pourtant, il aurait été inutile de vouloir dresser une simple liste de détails, recueillis au sein d’une compilation bariolée et forcément non exhaustive. Adoptant une perspective plus large, le présent ouvrage vise à une compréhension approfondie de la mécanique du détail (extrait de l'Avant-propos, L. Belloï & M. Hagelstein). [less ▲]

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See detailMécanique Rationnelle - Modèle Mathématique de Newton
Delhez, Eric ULg; Nihoul, Jacques ULg

Book published by Etienne Riga (1996)

Detailed reference viewed: 133 (12 ULg)
See detailMécanique Rationnelle - Modèle Mathématique de Newton
Delhez, Eric ULg

Book published by Editions du Perron (2011)

Detailed reference viewed: 156 (18 ULg)